In an interview, Kerris said he is putting together a small team to start the firm, including a technologist and a well-known marketer.

“Our goal is to make it a small boutique, but a prestigious company,” Kerris told AllThingsD.

The new consulting firm will work to help both established companies and startups create a coherent mobile strategy.

Kerris said many entertainers, artists and brands have developed a mobile app, gotten some downloads, but then seen their mobile efforts fizzle.

Meanwhile, he said, there are lots of startups that have a good idea but not a strong enough business plan or technical strategy to fully implement it. Nor, he said, can they get the attention they need from the major platforms.

“They can’t even get a return call,” he said.

Presumably, Kerris’s firm would be able to help with that, given his contacts at Microsoft, Nokia, Apple and elsewhere.

Kerris said he left Nokia on good terms, and will remain a consultant to them for the forseeable future.

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